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1. Not perceptible to the touch; intangible.
2. Difficult to perceive or grasp by the mind.

im·pal′pa·bil′i·ty n.
im·pal′pa·bly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.impalpably - not substantially; lacking substantial expression or fullness
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References in classic literature ?
Generally the atmosphere is hazy; and this is caused by the falling of impalpably fine dust, which was found to have slightly injured the astronomical instruments.
Prose, not poetry, looms too high when it aggregates "people" vaguely, typographically, and "sublimely" into complex populations like its impalpably dense printed words.
Ever since Charles Darwin noted "the falling of impalpably fine dust" while crossing the Atlantic during his famous scientific voyage aboard the Beagle, seafarers and researchers have observed African particulates far out to sea.